1) x^2 + x - 2 = 0(x + 2)(x - 1) = 0x + 2 = 0 или x - 1 = 0x = -2 или x = 1
2) 7x^2 - 6x + 2 = 0D = (-6)^2 - 472 = 36 - 56 = -20x = (6 ± √-20) / 14x = (6 ± 2√5i) / 14x = (3 ± √5i) / 7
3) 9x^2 + 12x + 4 = 0(x + 2)(9x + 2) = 0x + 2 = 0 или 9x + 2 = 0x = -2 или 9x = -2x = -2/9
4) 2x^2 - 7x - 4 = 0(2x + 1)(x - 4) = 02x + 1 = 0 или x - 4 = 0x = -1/2 или x = 4
5) 1 - 18p + 81p^2 = 0(1 - 9p)^2 = 01 - 9p = 09p = 1p = 1/9
1) x^2 + x - 2 = 0
(x + 2)(x - 1) = 0
x + 2 = 0 или x - 1 = 0
x = -2 или x = 1
2) 7x^2 - 6x + 2 = 0
D = (-6)^2 - 472 = 36 - 56 = -20
x = (6 ± √-20) / 14
x = (6 ± 2√5i) / 14
x = (3 ± √5i) / 7
3) 9x^2 + 12x + 4 = 0
(x + 2)(9x + 2) = 0
x + 2 = 0 или 9x + 2 = 0
x = -2 или 9x = -2
x = -2/9
4) 2x^2 - 7x - 4 = 0
(2x + 1)(x - 4) = 0
2x + 1 = 0 или x - 4 = 0
x = -1/2 или x = 4
5) 1 - 18p + 81p^2 = 0
(1 - 9p)^2 = 0
1 - 9p = 0
9p = 1
p = 1/9